Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e92cbe3987a143…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 06:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 378f0c186951275485257a46e517476a SHA-1: aa7c12c5bfbb3c113aed84b0f799dcdb53d7fc00 SHA-256: 57e92cbe3987a143ffe420a27ad73e7f1007bc10c9c5eb8f484ded60ef450af0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and links to algorithmically generated URLs, indicating a phishing or malware distribution attempt. The heuristic 'PDF_RANDOM_URL_LINK' and the presence of embedded JavaScript strongly suggest malicious intent, likely to download a second-stage payload or redirect the user to a malicious site. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lab4050.com/upload/editor/file/bibonewigijaribotegisi.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/rogowubesasasoporemad.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/lezolewademopejebawutazo.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/fixujamumobiwi.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/42141435060.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/28604246584.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/52792806122.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/wuzosanawigowu.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/30680039883.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109121349019523.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/gimedarano.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/45604982343.pdfIn PDF document text
    • http://airzo.net/userData/board/file/zumemejidibenaso.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/bipabalavukago.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/86905724310.pdfIn PDF document text
    • http://didopack.com/files/nuvutilib.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/47841806158.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/fizajuwupireva.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/xelunejemolevo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eme2o7tfcerbkbh04c4tb4cra2/64614398663.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/dazizufepirupogo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32e5765b0---nanuvufezawavujap.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/xejojegogaxag.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/33735268791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=playstation+iso+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 10208 bytes
SHA-256: ebb899ec54248e66fc616b5da731aa6de852c02af359b76bd184e810b13d8401
font_02_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 17288 bytes
SHA-256: 20cfc061ab8a9c343ba6cd1572bc80facb5e88c8baf4f0619b34501117322785